With brother Samuel, runs massive privately held media conglomerate Advance Publications, built up from newspaper properties their father Sam started buying in the 1930s. Pair took over after Sam's death in 1979, expanded and diversified. Now run Bright House Cable (2 million subscribers) and own pieces of the Discovery Channel and Learning Channel. "Si" heads magazines (New Yorker, Vanity Fair, Vogue) under Condé Nast. Trying to increase Web presence but biggest bet in on print: $100 million on Portfolio, a new biz mag due next year. Donald oversees newspaper division (Cleveland's Plain Dealer, Newark's Star-Ledger). Lauded for keeping New Orleans' Times-Picayune in business after Hurricane Katrina; paper won 2 Pulitzers for its coverage of storm's aftermath.

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